Answer:
[tex] - \frac{1}{3} {x}^{4} - \frac{4}{7} {x}^{2} + \frac{16}{3} [/tex]
Step-by-step explanation:
add/subtract the terms with same power of variable
[tex]( \frac{1}{6} {x}^{4} - \frac{1}{2} {x}^{4} ) + ( - \frac{ 3}{7} {x}^{2} - \frac{1}{7} {x}^{2} ) + (5 + \frac{1}{3} )[/tex]
